@mj I do not know what you intention was, but may something like this, which just changes the message content and initializes total for the first run.
import os
import socket
import time
import struct
import machine
import network
from network import LoRa
from machine import Timer
# A basic package header, B: 1 byte for the deviceId, B: 1 byte for the pkg size
_LORA_PKG_FORMAT = "BB%ds"
_LORA_PKG_ACK_FORMAT = "BBB"
DEVICE_ID = 0x01
# Open a Lora Socket, use tx_iq to avoid listening to our own messages
# Please pick the region that matches where you are using the device:
# Asia = LoRa.AS923
# Australia = LoRa.AU915
# Europe = LoRa.EU868
# United States = LoRa.US915
chrono = Timer.Chrono()
lora = LoRa(mode=LoRa.LORA, frequency = 915000000)
lora_sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
lora_sock.setblocking(False)
total = 0
while(True):
# Package send containing a simple string
msg = "Device 1 Here, Time difference %d total" % total
pkg = struct.pack(_LORA_PKG_FORMAT % len(msg), DEVICE_ID, len(msg), msg)
lora_sock.send(pkg)
# Wait for the response from the gateway. NOTE: For this demo the device does an infinite loop for while waiting the response. Introduce a max_time_waiting for you application
waiting_ack = True
while(waiting_ack):
recv_ack = lora_sock.recv(256)
chrono.start()
if (len(recv_ack) > 0):
device_id, pkg_len, ack = struct.unpack(_LORA_PKG_ACK_FORMAT, recv_ack)
if (device_id == DEVICE_ID):
if (ack == 200):
chrono.stop()
total = chrono.read_us()
waiting_ack = False
# If the uart = machine.UART(0, 115200) and os.dupterm(uart) are set in the boot.py this print should appear in the serial port
print("ACK")
else:
waiting_ack = False
# If the uart = machine.UART(0, 115200) and os.dupterm(uart) are set in the boot.py this print should appear in the serial port
print("Message Failed")
time.sleep(5)
